I had my dog in this same type of kennel with the same kennel jacket I bought for two 12 hour days of driving. I left in very cold weather. Driving at 70 mph put a wind chill out there of a little above zero. My dog was comfortable the entire time. The only down side is that if you want to roll up the kennel entrance flap and use the snaps to keep it open, like shown, driving down the road at any type of speed will pop the snaps. I was disappointed in this but it's the only con I had other than the fit is small. I had an extra large kennel and got the extra large jacket. It was tight. It did the job but I could have used a size above extra large, which they don't sell. Great buy though.